Thanks for your apprecaitive comments Wendy, and I hope your tomaroes will be good. I don’t think it can be aminopyralid if they are not all affected, more likely a varietal trait.
Funily enough I have just one variety of seven in my new greenhouse with Septoria Leaf Spot (Septoria lycopersis), and its top leaves are twisting and looking purple. I think it may be a seed borne disease (variety is Tastery from Rijk Zwaan via Tuckers Seeds).
Outside I have had early blight (Alternaria solani) on Swift potatoes from infected tubers, more about that in my blog update on 16th June.
Solanums are great veg but prone to disease! A book on summer veg is a good idea, thankyou. After Myths appearing March 2014 is Homeacres in Sept 14 and then another!